Design of polarization-based interleaver filter for DWDM mux/demux

Jianhong Shi; Xianfeng Chen; Xiaoxia Zhong; YuXing Xia; Yingli Chen

doi:10.1117/12.445059

17 October 2001 Design of polarization-based interleaver filter for DWDM mux/demux

Jianhong Shi, Xianfeng Chen, Xiaoxia Zhong, YuXing Xia, Yingli Chen

Proceedings Volume 4581, Passive Components and Transmission Systems; (2001) https://doi.org/10.1117/12.445059
Event: Asia-Pacific Optical and Wireless Communications Conference and Exhibit, 2001, Beijing, China

Abstract

Spurred by exploding demand for transmission capacity, several techniques have been developed in dense wavelength division multiplexing(DWDM) systems for packing as many channel as possible into fibre-amplifier active regions. An interleave filter, which separates DWDM signal channels with equal spacing into two groups with twice the spacing, has received much attention. To be effective, this filter must have a wide flat-top passband, low insertion loss, minimal crosstalk and low dispersion. A polarization-based interleave filter can be fabricated by using cascaded birefringent crystals. Filter of this type can provide superior peak flatness and isolation for narrow channel spacing over what can be obtained in traditional interferometric devices. In such filter, the crystals are cut with their optic axes perpendicular to their length. By using a method based on an analogy to the synthesizing of finite impulse response(FIR) digital filters, the angles of the optic axes and the length of the crystals can be determined. An example of the design of a three cascade birefringent crystals, 50GHz polarization-based interleave filter is described. The allowable parameter error for this filter is also discussed. Furthermore, a polarization-based filter, which can separate the upper and lower channels of an input DWDM signal, can be designed by using this synthesizing method.

Citation Download Citation

Jianhong Shi, Xianfeng Chen, Xiaoxia Zhong, YuXing Xia, and Yingli Chen "Design of polarization-based interleaver filter for DWDM mux/demux", Proc. SPIE 4581, Passive Components and Transmission Systems, (17 October 2001); https://doi.org/10.1117/12.445059

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